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What are the oxidation numbers for CrO4-2?
-2 for each O and +3 for N in NO2-
+6 for Cr, -2 for each O in Cr2O72- oxidation number for oxygen is -2 so 7 of them makes -14 in total but the compound has an overall charge of 2- so therefore +12 is required…. As there are two chromium then the oxidation number for each one is +6
+6. Working this out is tricky. Not knowing the structure, and assuming each oxygen was present as O2- you would have to say -7. This is difficult to understand as S has o…nly 6 valence electrons. The structure is actually O3SOOSO3,(see link), 6 oxide ions (oxidation number -2) and 1 peroxide ion (overall oxidation number -2, average oxygen oxidation number of -1) . Overall the oxygen atoms contribute -14, and less the charge on the ion of -2 gives the total oxidation number of both sulfur atoms as +12, so each sulfur is +6. This is a lot more sensible. S has its maximum oxidation number of +6 as it does in SO3 and SO42-.
+6 2x-12-2=-2 2x=12 x=6 This is because there are 1 peroxy bond in S2O82- because of which 2 of the 8 oxygen atoms have -1 oxidation state other 6 Oxygen atoms have -2
-2 for sulphur ins S2- ion
-2 for each O +6 for Cr
Overall the anion has an oxidation number of -2, the same as its charge. The Cr is +6 and the O are all -2.
S has an oxidation number of +6 in sulfate ion ( O is -2 the overall charge is -2 so S must be +6)
C=x O= -2 (rule) (CO3)-2 has a charge of -2 x+ 3(-2)=-2 x=4 C=4 O=-2
-2 for each O, +6 for each Cr
This is the thiosulfate ion. Sulfur shows +6 oxidation number.
SO3 is a acidic gas.. Sulphar shows +6 oxidation number.
In compounds such as H2Se yes it is, and the oxidation number ofd -2 is well known. However there are many compounds where Se has other oxidation numbers (Se is very simil…ar to Sulfur another group 16 elemnt) for example compounds where Se has an ox number of +4, SeF4, +6, SeF6, -1 in the polyselenide compound Na2Se2